Alloy.



UNIT D STATES PATENT OFFICE.

TRUMAN s. FULLER,- 0F SGHENECTADY, NEW YORK, AssIeNoR T0 GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

y ALLOY.

Specification of Letters Patent.

Patented July 23, 1918.

Application filed May 24, 1917. Serial No. 170,733.

To all whom it may concern:

Be it known that I, TRUMAN S. FULLER,

a citizen of the United States, residing at Schenectady, county of Schenectady, State of New York, have invented certain new and .alloy containing 'aluminum magnesium', zinc and either iron, chromium, cobalt, nickel, titanium or manganese, or a mixture of the same.

The addition of iron or one of the abovedescribed equivalents increases the tensile strength, hardness and stifiness of alloys containing aluminum, magnesium and zinc. Preferably the metal of theiron group is present in amounts of about 1 to 3%.

When preparing an alloy embodying my invention, containlng iron for example, the

aluminum is melted and the iron is added either as substantially pure iron, or as an alloy of aluminum and iron, until a homogeneous alloy containing the desired amount of iron is produced by the solution of the iron in the aluminum. The desired propor tion of zinc is then added to the melted alloy. Finally the magnesium is added and the alloy is immediately cooled as by casting or in any suitable manner. Alloys containing chromium, cobalt, nickel, titanium or manganese may be made in a similar mannese, the balance totaling 100% consisting of aluminum, although these proportions maybe departed'from when special properties for special uses are desired.

The following specific examples illustrate the improvement in tensile strength effected by iron or equivalent metal. An alloy consisting of about 92.7 5% aluminum, 6% zinc, 1.25% magnesium has an ultimate tensile strength of about 46,100 pounds per sq. in. An alloy of 90.75% aluminum, 6% zinc, 1.25% magnesium and 2% iron has an ultimate tensile strength of 69,600 pounds. In other words, thesubstitution'of 2% aluminum by 2% iron effects an increase in tensile strength of over 50%. An alloy of 86.75% aluminum, 12% zincand 1.25% magnesium has an ultimate tensile strength of 53,600 pounds. By replacing 3% of the aluminum by 3% iron the ultimate tensile strengthis increased to 63,000 poundsor 1 about 18%.

I desire by the appended claims to cover not only an alloy of aluminum, magnesium, zinc and iron but also metals equivalent to iron for this purpose, such as chromium,

cobalt, nickel, titanium or manganese.

What I claim as new and desire to secure by Letters Patent of the United States,'is,-

1. An dlloy containing aluminum, at least several per cent. of zinc, at least about onehalf per cent. ofmagnesium and at least aboutone per cent. of iron. =1

2. An alloy containing aluminum) at'least several per cent. of zinc, at least about onehalf per cent. of magnesium and/about one to three per cent. of iron.

3. An alloy consisting of about 6 to 12 per cent. of zinc, about a to 2% percent. of magnesium, about 1 to 3 per cent.'of iron and the balance of aluminum.

..In witness whereof, I have hereunto set my hand this 23rd day of May, 1917.

TRUMAN S. FULLER. 

